CAS 25322-68-3: Polyethylene Glycol (PEG 400) ((C2H4O)nH2O)

Identity

CAS Number25322-68-3
Molecular Formula(C2H4O)nH2O
IUPAC Namepolyethylene glycol
Molecular Weight400.0 g/mol
SMILESOCCOCCOCCO
SynonymsPEG, polyethylene oxide, Carbowax, macrogol

2D Structure

Physical Properties

Density1.128 g/mL at 25°C
Boiling Point250.0°C
Melting Point-65.0°C
Flash Point220.0°C
Vapor Pressure0.0 kPa at 20°C
Refractive IndexnD = 1.466
Dielectric Constantε = 12.5

Safety & GHS Classification

Storage: Store in tightly sealed containers. Hygroscopic — absorbs moisture. Very low toxicity. Viscous liquid — warming reduces viscosity for transfer. PEG molecular weights range from 200 to 35,000+.

Material Compatibility Matrix

Plastics

MaterialRating
PTFEExcellent
PVCGood
PEGood
PPExcellent
PEEKExcellent
PVDFExcellent

Rubbers

MaterialRating
VitonGood
NBRGood
EPDMExcellent
SiliconeGood
FKMGood

Metals

MaterialRating
Stainless 316Excellent
AluminumExcellent
CopperExcellent
BrassExcellent

Applications

External References: PubChem

Related Chemicals

CAS 110-82-7

Cyclohexane (C6H12)

hexamethylene, hexanaphthene

CAS 75-09-2

Dichloromethane (Methylene Chloride) (CH2Cl2)

methylene chloride, DCM

CAS 109-99-9

Tetrahydrofuran (THF) (C4H8O)

THF, oxolane